I have no idea how you got along with this, or whether you've taken it any further. Another avenue to explore - at no cost to yourself would be a complaint to RIBA (Royal Institute of British Architects), as to call yourself an Architect in England you have to belong to this group and they have very strict rules on guidelines on membership - this case seems to me something they would not look favorably on and I believe they would certainly contact the architect with a view to asking him to explain himself. It may not get you your money back, but on the other hand - it may do if the architect realises he has infringed some rule and needs to satisfy RIBA he has done everything to redeem the situation. Worth a try anyway.